Questions tagged [shared-memory]
Memory that may be simultaneously accessed by multiple programs
shared-memory
3,187
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Why can't a shared memory file locked by flock() be unlocked automatically when closing the file descriptor?
This snippet is designed to lock a shared memory file by flock() for 10 seconds and then release the lock. I ran it on two terminals to test if the lock is effective.
void main(void) {
int fd = ...
- 1
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15
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How to use shm_open() with a Unique Filename (or alternatives)
I am writing a set of programs on Linux that use shared memory. Currently I call shm_open() with a predetermined name for the shared memory. This works fine as I currently only have one set of ...
1
vote
1
answer
90
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How can decrease time of creating and insert in boost::interprocess::map?
In the below code I unpack a msgpack file to std::map. The duration of this process is almost 85 seconds.
#include <map>
#include <vector>
#include <string>
#include <iostream>
...
- 190
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49
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--shm_size change for Docker in Nextflow pipeline: containerOptions not seeming to work
I am trying to increase the shared memory size for the Docker image being used to run a Nextflow pipeline. Per some indications online, I have added the following to my config file:
docker {
...
- 419
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29
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How should I initialize pthread mutexes in shared memory, since at program start they can be already initialized?
I'm using shared, robust pthread mutexes to protect some shared memory areas I have in my application. Since my program is managed by a systemd service, it could potentially be restarted, in which ...
2
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1
answer
85
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Multiprocessing shared memory to pass large arrays between processes
Context: I need to analyse some weather data for every hour of the year. For each hour, I need to read in some inputs for each hour before performing some calculation. One of these inputs is a very ...
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30
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How does mmap'ed eBPF map shared between processes synchronizes operations?
It's possible to mmap eBPF map of type BPF_MAP_TYPE_ARRAY. I have a configuration where multiple processes access this mmaped map that contains entries of type "some cacheline-sized struct" ...
- 463
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How to share a matrix in shared memory across multiple users using R/bigmemory
I have a matrix in shared memory that I want to access (read-only) by multiple users using R/bigmemory. Is it possible and how? I tried to change the rights of the files in shared memory, but it's not ...
- 3,755
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Is there a way to write an image to memory with Python and read it from another application written in C++?
I would like to create and write an image to the memory in such a way that other processes are able to read it. The goal is to have a Python script create some graph using matplotlib.pyplot, write it ...
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92
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Error with operations on the elements in shared memory C
I made this code that inserts a structure into shared memory. I made debug prints to try to figure out where the processes were stopping and why there was an error. Apparently by doing operations on ...
- 203
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Problem with malloc and shared memory in C
I am trying to put shared_pid_data in shared memory. I need to have a dynamic array, so I use malloc, I also tried using calloc getting the same result. The problem I am encountering is that the data ...
- 203
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Registering POSIX-CPU shared memory to CUDA with cudaHostRegister
Hardware: I am using a Jetson AGX Orin.
I am trying to set an IPC between multiples processes to stream a video. I use a classic shm_open/mmap shm mechanism, then I try to map it on CUDA with pinned/...
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30
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Should I handle the memory order when using Posix-MQ and SHM within multi-processes?
I'm using a block of SHM to sharing data within multiple Linux processes.
When the producer put some data into the SHM, it sends a message to the consumer through a Posix-MQ. This message carries a ...
- 1,997
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87
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Accessing X11 window pixel data over shared memory
I am writing a program in which I need to access a X11 window's pixel data as efficiently as possible, ideally over shared memory, without needing to make XCB calls every time I want to refresh the ...
- 4,866
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active waiting in the main process C
I made this code in C that allows me to create a secondary process that does certain things. The main process has to wait until the other process is ready before starting with program execution. For ...
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